An unhealthy obsession with the iPhone game Angry Birds. The disease is named as such because "irritable fowl" has a meaning similar to that of "angry bird."

Boss: "Hey Joe, would you mind stepping into my office? I think we need to have a little talk."
Joe: "Sure, what is it?"
Boss: "That was your third half-hour trip to the bathroom today and it's only 1:30. What's going on?"
Joe: "Unfortunately I suffer from Irritable Bowel Syndrome. We had chili for dinner last night, and it really hasn't been sitting well with me today."
Boss: "Hmm...well I asked some of your coworkers about it and they mentioned hearing sounds of chirps and snorts coming from one of the stalls on several occasions. It's Irritable Fowl Syndrome you're really suffering from, isn't it?"
Joe: "All right, I admit it! I can't stop playing Angry Birds!"
Boss: "Well lucky for you, you'll have plenty of time to chase those golden eggs during your unemployment!"